The extrahepatic role of TFR2 in iron homeostasis

Laura Silvestri, Antonella Nai, Alessia Pagani, Clara Camaschella

Research output: Contribution to journalArticle

Abstract

Transferrin receptor 2 (TFR2), a protein homologous to the cell iron importer TFR1, is expressed in the liver and erythroid cells and is reported to bind diferric transferrin, although at lower affinity than TFR1. TFR2 gene is mutated in type 3 hemochromatosis, a disorder characterized by iron overload and inability to upregulate hepcidin in response to iron. Liver TFR2 is considered a sensor of diferric transferrin, possibly in a complex with hemochromatosis protein. In erythroid cells TFR2 is a partner of erythropoietin receptor (EPOR) and stabilizes the receptor on the cell surface. However, Tfr2 null mice as well as TFR2 hemochromatosis patients do not show defective erythropoiesis and tolerate repeated phlebotomy. The iron deficient Tfr2-Tmprss6 double knock out mice have higher red cells count and more severe microcytosis than the liver-specific Tfr2 and Tmprss6 double knock out mice. TFR2 in the bone marrow might be a sensor of iron deficiency that protects against excessive microcytosis in a way that involves EPOR, although the mechanisms remain to be worked out.

Original languageEnglish
Article number93
JournalFrontiers in Pharmacology
Volume5 MAY
DOIs
Publication statusPublished - 2014

Fingerprint

Transferrin Receptors
Homeostasis
Iron
Erythropoietin Receptors
Erythroid Cells
Knockout Mice
Liver
Hepcidins
Iron Overload
Phlebotomy
Hemochromatosis
Erythropoiesis
Cell Surface Receptors
Up-Regulation
Cell Count
Bone Marrow
Genes
Proteins

Keywords

  • Hemochromatosis
  • Hepcidin
  • iron deficiency
  • Iron metabolism
  • Transferrin
  • Transferrin receptors

ASJC Scopus subject areas

  • Pharmacology (medical)
  • Pharmacology

Cite this

Silvestri, L., Nai, A., Pagani, A., & Camaschella, C. (2014). The extrahepatic role of TFR2 in iron homeostasis. Frontiers in Pharmacology, 5 MAY, [93]. https://doi.org/10.3389/fphar.2014.00093

The extrahepatic role of TFR2 in iron homeostasis. / Silvestri, Laura; Nai, Antonella; Pagani, Alessia; Camaschella, Clara.

In: Frontiers in Pharmacology, Vol. 5 MAY, 93, 2014.

Research output: Contribution to journalArticle

Silvestri, L, Nai, A, Pagani, A & Camaschella, C 2014, 'The extrahepatic role of TFR2 in iron homeostasis', Frontiers in Pharmacology, vol. 5 MAY, 93. https://doi.org/10.3389/fphar.2014.00093
Silvestri, Laura ; Nai, Antonella ; Pagani, Alessia ; Camaschella, Clara. / The extrahepatic role of TFR2 in iron homeostasis. In: Frontiers in Pharmacology. 2014 ; Vol. 5 MAY.
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